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Commit | Line | Data |
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1f067167 YL |
1 | #include <linux/kernel.h> |
2 | #include <linux/errno.h> | |
3 | #include <linux/string.h> | |
4 | #include <linux/types.h> | |
5 | #include <linux/mm.h> | |
6 | #include <linux/smp.h> | |
7 | #include <linux/init.h> | |
8 | #include <linux/pfn.h> | |
9 | ||
10 | #include <asm/e820.h> | |
11 | ||
6d74171b AH |
12 | static u64 patterns[] __initdata = { |
13 | 0, | |
14 | 0xffffffffffffffffULL, | |
15 | 0x5555555555555555ULL, | |
16 | 0xaaaaaaaaaaaaaaaaULL, | |
63823126 AH |
17 | 0x1111111111111111ULL, |
18 | 0x2222222222222222ULL, | |
19 | 0x4444444444444444ULL, | |
20 | 0x8888888888888888ULL, | |
21 | 0x3333333333333333ULL, | |
22 | 0x6666666666666666ULL, | |
23 | 0x9999999999999999ULL, | |
24 | 0xccccccccccccccccULL, | |
25 | 0x7777777777777777ULL, | |
26 | 0xbbbbbbbbbbbbbbbbULL, | |
27 | 0xddddddddddddddddULL, | |
28 | 0xeeeeeeeeeeeeeeeeULL, | |
29 | 0x7a6c7258554e494cULL, /* yeah ;-) */ | |
6d74171b | 30 | }; |
40823f73 | 31 | |
570c9e69 | 32 | static void __init reserve_bad_mem(u64 pattern, u64 start_bad, u64 end_bad) |
7dad169e | 33 | { |
570c9e69 AH |
34 | printk(KERN_INFO " %016llx bad mem addr %010llx - %010llx reserved\n", |
35 | (unsigned long long) pattern, | |
36 | (unsigned long long) start_bad, | |
37 | (unsigned long long) end_bad); | |
7dad169e AH |
38 | reserve_early(start_bad, end_bad, "BAD RAM"); |
39 | } | |
40 | ||
570c9e69 | 41 | static void __init memtest(u64 pattern, u64 start_phys, u64 size) |
1f067167 | 42 | { |
9866b7e8 | 43 | u64 *p, *start, *end; |
570c9e69 AH |
44 | u64 start_bad, last_bad; |
45 | u64 start_phys_aligned; | |
9866b7e8 | 46 | const size_t incr = sizeof(pattern); |
1f067167 | 47 | |
1f067167 | 48 | start_phys_aligned = ALIGN(start_phys, incr); |
1f067167 | 49 | start = __va(start_phys_aligned); |
9866b7e8 | 50 | end = start + (size - (start_phys_aligned - start_phys)) / incr; |
1f067167 YL |
51 | start_bad = 0; |
52 | last_bad = 0; | |
53 | ||
c9690998 AH |
54 | for (p = start; p < end; p++) |
55 | *p = pattern; | |
9866b7e8 | 56 | |
c9690998 AH |
57 | for (p = start; p < end; p++, start_phys_aligned += incr) { |
58 | if (*p == pattern) | |
7dad169e AH |
59 | continue; |
60 | if (start_phys_aligned == last_bad + incr) { | |
61 | last_bad += incr; | |
62 | continue; | |
1f067167 | 63 | } |
7dad169e AH |
64 | if (start_bad) |
65 | reserve_bad_mem(pattern, start_bad, last_bad + incr); | |
66 | start_bad = last_bad = start_phys_aligned; | |
1f067167 | 67 | } |
7dad169e AH |
68 | if (start_bad) |
69 | reserve_bad_mem(pattern, start_bad, last_bad + incr); | |
1f067167 YL |
70 | } |
71 | ||
bfb4dc0d AH |
72 | static void __init do_one_pass(u64 pattern, u64 start, u64 end) |
73 | { | |
74 | u64 size = 0; | |
75 | ||
76 | while (start < end) { | |
77 | start = find_e820_area_size(start, &size, 1); | |
78 | ||
79 | /* done ? */ | |
80 | if (start >= end) | |
81 | break; | |
82 | if (start + size > end) | |
83 | size = end - start; | |
84 | ||
85 | printk(KERN_INFO " %010llx - %010llx pattern %016llx\n", | |
86 | (unsigned long long) start, | |
87 | (unsigned long long) start + size, | |
88 | (unsigned long long) cpu_to_be64(pattern)); | |
89 | memtest(pattern, start, size); | |
90 | ||
91 | start += size; | |
92 | } | |
93 | } | |
94 | ||
1f067167 YL |
95 | /* default is disabled */ |
96 | static int memtest_pattern __initdata; | |
97 | ||
98 | static int __init parse_memtest(char *arg) | |
99 | { | |
100 | if (arg) | |
101 | memtest_pattern = simple_strtoul(arg, NULL, 0); | |
d1a8e779 YL |
102 | else |
103 | memtest_pattern = ARRAY_SIZE(patterns); | |
104 | ||
1f067167 YL |
105 | return 0; |
106 | } | |
107 | ||
108 | early_param("memtest", parse_memtest); | |
109 | ||
110 | void __init early_memtest(unsigned long start, unsigned long end) | |
111 | { | |
6d74171b | 112 | unsigned int i; |
bfb4dc0d | 113 | unsigned int idx = 0; |
1f067167 YL |
114 | |
115 | if (!memtest_pattern) | |
116 | return; | |
117 | ||
570c9e69 | 118 | printk(KERN_INFO "early_memtest: # of tests: %d\n", memtest_pattern); |
6d74171b | 119 | for (i = 0; i < memtest_pattern; i++) { |
bfb4dc0d AH |
120 | idx = i % ARRAY_SIZE(patterns); |
121 | do_one_pass(patterns[idx], start, end); | |
122 | } | |
123 | ||
124 | if (idx > 0) { | |
125 | printk(KERN_INFO "early_memtest: wipe out " | |
126 | "test pattern from memory\n"); | |
127 | /* additional test with pattern 0 will do this */ | |
128 | do_one_pass(0, start, end); | |
1f067167 | 129 | } |
1f067167 | 130 | } |